CN1532559A - Clutter rejection technology using AM voice broadcast and TV broadcast signal to detect stealth plane - Google Patents
Clutter rejection technology using AM voice broadcast and TV broadcast signal to detect stealth plane Download PDFInfo
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- CN1532559A CN1532559A CNA031130259A CN03113025A CN1532559A CN 1532559 A CN1532559 A CN 1532559A CN A031130259 A CNA031130259 A CN A031130259A CN 03113025 A CN03113025 A CN 03113025A CN 1532559 A CN1532559 A CN 1532559A
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Abstract
The 'stealth radar' is one kind of detection system emitting no any energy and utilizing the energy of TV and other broadcast signal for detecting airplane, missile, and especially stealth airplane, stealth war ship, cruise missile and robot aircraft. The present invention operates on the multiplication relation among directive wave, multipath wave and image carrier and the addition relation between the target scattered wave and any of the said waves; and no original carrier component existing in the self orthogonal product of carrier signal. The kernel of the separation technology is to obtain relevant carrier and directive wave and self-correlating treatment of multipath wave to inhibit clutter and maintain the target wave. By means of the signals of both I and Q channel in two kinds of FFT operation and the correlation processing of the result, holographic target signal output is obtained.
Description
Utilize the broadcasting of AM language, the clutter inhibition technology one holographic quadrature that television broadcasting signal is surveyed in " stealthy " aircraft offsets.The present invention relates to " hot topic " technology of anti-" stealthy " aircraft of research in the world, its reason:
1, this radar adopts metric wave basically, makes that " stealthy " aircraft is difficult to absorb, therefore " stealthy " become not " stealthy ".
2, this radar self emitted energy not is so the enemy is difficult to find that the American is called " reticent sentry ".
3, this radar directly receives the scattering wave of dimensional energy such as TV AM, radio station to target, utilizes dobla (must tape symbol), and the flight path of target is asked in orientation (DOA) and alpha-beta-γ or Kalman's filter.With European countries be in the world representative be to adopt above method, but lack effective clutter suppression method, so be difficult to successfully; And with the U.S. be representative be utilize statistical theory and ask the such calculated amount of method such as ambiguity function too big, operating distance far because most of energy is too little in the envelope spectrum, does not also lack effective clutter suppression method simultaneously simultaneously.
The present invention is the invention after the patent No. 0311269.1, that invention is suitable for the multistation location or can reduces the number of times of asking ambiguity function, through experimental results show that, clutter suppresses to reach more than the 47dB, total inhibition reaches 77dB, by national General Armament Department and air force and national radar authority hosting, be accredited as the evaluation of " reach domestic initiation, have great military significance and economic implications " through provincial tissue.But this technology lacks the symbol of dobla, and the formula of substitution flight path is fuzzy with regard to generation like this, and the position of can not singly standing firm can only be located by multistation, but the meeting appearance of multistation location is many-valued, and is difficult to clarification, and therefore, the present invention is better than the invention of front.
The present invention (1) extracts the carrier wave in the clutter; (2) quadrature is relevant is meant that the carrier phase of extraction and the carrier phase in the target antenna echo differ 90 °; (3) carrier phase extracted of another road and the carrier phase in the target antenna echo differ zero degree or 180 °; (4) after I, Q output, carry out two kinds of fast Fourier transforms, a) utilize I, Q branch road to obtain FFT, and can dig up fixedly interference or weighting or symmetrical video cancellation: b) utilize the Q branch road to carry out FFT, (5) preceding FFT carries out permanent empty well processing respectively with back FFT, differentiate and to carry out relevance ratio then, signal above thresholding is all arranged, then confirm as target at last for the wave filter among each FFT.The existing dobla of this target has promptly embodied the size of aggregate velocity, has also reflected DOA and amplitude size simultaneously, through handling, obtains angle information.Utilize fd (n), Q (n) just can obtain the flight path of this target at last.
The present invention is actually the holography " quadrature " that grows up on the basis of unidirectional " quadrature ", because really obtained the size and Orientation of target aggregate velocity.Be actually the combination of two kinds of clutter inhibition technology.0311269.1 technology U.S. Newsweek once was referred to as the Chinese domestic technology of " revolutionary character " in November, 1999.(publish originally Reference News on Dec 1st, 1999)
Description of drawings:
Main antenna receives direct wave, multipath ripple, land clutter and target scattering ripple.The direct wave antenna receives direct wave, multipath rolling land clutter facing to TV station.CF signal can utilize phaselock technique to extract from main antenna or direct wave aerial receiver, (by the K decision).One the tunnel utilizes quadrature relevant (phaselock technique) to make the CF signal in carrier wave and the main antenna received signal keep 90 ° (tracking) to be the Q branch road after the carrier extract, carries out FFT after the low pass of footpath and handles; Another road phase-shifting carrier wave is the I branch road with another road main antenna signal correction (output of main antenna receiver is divided into two-way) for 90 °, and the footpath low pass is also utilized I, Q two-way to carry out FFT and handled.Utilize the Q branch road to carry out the FFT processing and meet single-phase orthogon theory, utilize I, Q two-way to carry out FFT again and handle, carry out conjugation again and handle promptly: { U
1(t)+U
2(t) } U
3 *(t)+{ U
1 *(t) }+U
2 *(t)) } U
3(t)=0 wherein: U
1(t), U
2(t) be FFT two symmetrical side frequency signals afterwards respectively, U
1(t)
*U
2(t)
*Be their conjugated signal, U
3(t) be CF signal, U
3 *(t) be its conjugation.Conjugation obtains echo signal after handling, and in order to guarantee probability of detection, the result who utilizes two-way FFT to handle again carries out co-channel correlation discriminating, all is that " 1 " is target, and other is clutter or noise.So just find target and its dobla value.
Claims (6)
- " stealth " radar is oneself not emitted energy, by other civilian transmitter,, run into target and produce scattering as the energy of TV, broadcasting, satellite, " stealthy " radar receives the scattared energy of target, also receives land clutters such as very strong direct wave, multipath ripple simultaneously.So " stealthy " radar mainly is how to isolate the target scattering ripple from these mixing ripples.
- 1, land clutters such as the direct wave that produces for television image signal, multipath ripple, as long as obtain their correlated carrier wave, again with original mixing ripple in carrier wave to carry out quadrature relevant, after filtering, just can curb land clutters such as direct wave, multipath ripple, and remaining target scattering ripple.
- 2,,, just can isolate the scattering wave of target as long as the carrier wave that obtains being correlated with mixes ripple with original direct wave, multipath ripple, target scattering ripple etc. then and carries out the quadrature relevant treatment for amplitude modulation language broadcasting.
- 3, the concrete feature of the present invention is acquisition, quadricorrelator, the low-pass filter of correlated carrier wave.
- 4, another feature of the present invention be exactly the output that utilizes each wave filter among I, the Q passage FFT with Q branch road FFT in the corresponding output of each wave filter carry out relevance ratio, and obtain the method for holographic dobla.
- 5, press the technology of the expansion of right 1,2,3,4, all should obtain protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031130259A CN1532559A (en) | 2003-03-21 | 2003-03-21 | Clutter rejection technology using AM voice broadcast and TV broadcast signal to detect stealth plane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNA031130259A CN1532559A (en) | 2003-03-21 | 2003-03-21 | Clutter rejection technology using AM voice broadcast and TV broadcast signal to detect stealth plane |
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| CN1532559A true CN1532559A (en) | 2004-09-29 |
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| CNA031130259A Pending CN1532559A (en) | 2003-03-21 | 2003-03-21 | Clutter rejection technology using AM voice broadcast and TV broadcast signal to detect stealth plane |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI575245B (en) * | 2014-05-29 | 2017-03-21 | 羅伯特Ｗ 李 | Signal-processing systems and methods for echo ranging systems, and related computer program products |
-
2003
- 2003-03-21 CN CNA031130259A patent/CN1532559A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI575245B (en) * | 2014-05-29 | 2017-03-21 | 羅伯特Ｗ 李 | Signal-processing systems and methods for echo ranging systems, and related computer program products |
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